Chapter 13: Magnetic Effects of Electric Current- Exercise- 7
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Chapter: 13 Magnetic Effects of Electric Current
Class X
Exercise 7
Question 1
State the principle of an electric generator.
Answer 1
An electric generator is works on the principle of electromagnetic induction. If a rectangular coil is rotated in a uniform magnetic field, an induced voltage is generated between the ends of the coil.
Question 2
Name some sources of direct current.
Answer 2
A battery and a D.C. generator, are some of the sources of direct current.
Question 3
Which sources produce alternating current?
Answer 3
Investor, which is used in house for emergency power supply, and A.C. generator produces alternating current.
Question 4
Choose the correct option.
A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each
- two revolutions
- one revolution
- half revolution
- one-fourth revolution
Answer 4
- The direction of the induced current changes once in each half revolution, when a rectangular coil of copper wire is rotated in a magnetic field.
